The 1st round called the Phase 1 of ZS Associates consists of 3 sub rounds, all of which are elimination rounds. 1. Aptitude round: 40 questions based on quants, logical reasoning, verbal and data interpretation. The questions are easy however you have to be quick so as to cover maximum questions. 2. Mini case study round: If you clear the cut off of aptitude round, you will be shifted to the next round within 1 min. This is a mini case study round wherein you are expected to answer based on the information provided in forms of charts and table. 3. Video Interview: Once you clear the mini case study round, the final round of phase 1 will begin. Here you will be given 10 seconds to read the question and prepare an answer, and 3 mins to record the answer. Here you will generally get questions on guesstimates and/or HR based questions. You can practise aptitude questions on Indiabix, adda, etc. For the mini case study, your general understanding of the case study will determine how you answer the questions ( you can use the book "case in point" to get familiar with case study solving and it will also help in the phase 2 round of ZS.) For video interview, it's really really important to keep calm. I was very surprised when the 1st question came and didn't know what to do in 10 secs so I fumbled a bit in the starting. So it's important to keep your mind calm and then answer. Because there is usually no correct answer, it's your approach that matters in such questions.
This is the phase 2 of interview process. It consists of 3 sub rounds: 1. Case study solving(non elimination): This is an online test for 60 mins, where you have to go through the case study and answer 6-8 questions based on the case study. You have to write the answers/ approach on the rough sheet and upload it, this rough sheet will be referred to during the interview. The case study has medium difficulty level. You can practise from the book " case in point". For this round, along with getting correct answers it's really important for you to be clear with the approach you used and have logical reasons to back your answers. Of course if your answers are correct, it will give you a confidence in the interview, but even if your answers turn out to be wrong, it's important to be able to have a discussion with the interviewer and explain your approach, get his/ her feedback and accordingly continue the conversation. 2. Case study interview(elimination round): Here you can expect a detailed discussion on the case study as mentioned above. In my case, I got 6/7 questions correct in my case study round , so it wasn't much detailed, I was asked about my approach for the qualitative questions. It's really important to not discuss your answers with anyone else before the interview, because you might get confused and you won't be able to explain an approach of someone else with complete clarity and thus interviewer will end up knowing that you have discussed. The next part of the same interview was guesstimates, puzzles and brain teasers. I could solve 2/4 puzzles and was asked a guesstimate regarding number of traffic lights in delhi. The interview ended with him giving me feedback about my analytical and creative thinking skills and where I should improve.
The EBI round is the 3rd and the last round of Phase 2. 1. I expected questions based on resume, however the interviewer was very friendly and we started with introducing ourselves and he asked me why I wanted to do consulting/ analytics , since I mentioned in my introduction. He grilled me for 10 mins as to why I want to branch out of Electrical. Then he asked me which guesstimate I was asked in the previous interview , asked my approach and then asked me to solve the same question with different data. He gave me a lot of feedback and discussed my career goals. In the end I asked him about his role since in his introduction he mentioned about it and I was curious to know what exactly he did. The interview ended in 35 mins.
The case study round is all about your approach and problem solving skills so don't worry too much about whether the answers are correct. As long as you are able to communicate how you came with the answer , it's fine.